664204025 has 12 divisors (see below), whose sum is σ = 872061372. Its totient is φ = 500106240.

The previous prime is 664204007. The next prime is 664204027. The reversal of 664204025 is 520402466.

It can be written as a sum of positive squares in 6 ways, for example, as 73908409 + 590295616 = 8597^2 + 24296^2 .

It is a de Polignac number, because none of the positive numbers 2^k-664204025 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (664204027) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 780992 + ... + 781841.

It is an arithmetic number, because the mean of its divisors is an integer number (72671781).

Almost surely, 2^664204025 is an apocalyptic number.

It is an amenable number.

664204025 is a deficient number, since it is larger than the sum of its proper divisors (207857347).

664204025 is a wasteful number, since it uses less digits than its factorization.

664204025 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1562860 (or 1562855 counting only the distinct ones).

The product of its (nonzero) digits is 11520, while the sum is 29.

The square root of 664204025 is about 25772.1560021664. The cubic root of 664204025 is about 872.5034797058.

The spelling of 664204025 in words is "six hundred sixty-four million, two hundred four thousand, twenty-five".